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Risks Arising from Financial Instruments - Summary of Foreign Exchange Results Recognized on Unhedged and Hedged Exposures (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net foreign exchange results [line items]      
Net foreign exchange $ (386) $ (147) $ (353)
Hedged (economic hedges) [Member]      
Net foreign exchange results [line items]      
Net foreign exchange 93 (186) 70
Not hedged [Member]      
Net foreign exchange results [line items]      
Net foreign exchange $ (479) $ 40 $ (423)